feat(scheduler): use an worker pool for scheduler (#1146)

Signed-off-by: Petu Eusebiu <peusebiu@cisco.com>

pkg/extensions/sync/sync.go

@@ -384,6 +384,7 @@ func syncRegistry(ctx context.Context, regCfg RegistryConfig,
 
 					return err
 				}
+
 				// push from cache to repo
 				err = pushSyncedLocalImage(localRepo, tag, localCachePath, imageStore, log)
 				if err != nil {

pkg/extensions/sync/sync_test.go

@@ -1047,7 +1047,7 @@ func TestMandatoryAnnotations(t *testing.T) {
 		defer dcm.StopServer()
 
 		// give it time to set up sync
-		time.Sleep(5 * time.Second)
+		time.Sleep(10 * time.Second)
 
 		resp, err := destClient.R().Get(destBaseURL + "/v2/" + testImage + "/manifests/0.0.1")
 		So(err, ShouldBeNil)